Analog sticks, vibration, motion controls, wireless controls. I would say those are the vast majority of the key console innovations over the past 15 years (all Nintendo created).
And while the WiiU is failing right now I am glad Nintendo releases a new console that doesn't just rely on providing better graphics. Eventually the console world will reach a point where the graphical improvements on new consoles become less and less impressive. When that point comes I'd love to see Sony or Microsoft come to the rescue with innovations as successful as analog sticks or vibration.
Analog sticks... even the Atari 5200 had that hell even then the PC says Hi
Motion controls... Sega Bass Fishing, Samba De Amigo....
Wireless controls... Atari 2600
Vibration... PC Again
Oh God no, it's starting!